Preparation method of seawater mixed cement soil

Abstract

The invention provides a preparation method of seawater mixing cemented soil. The preparation method comprises the steps of adding seawater and cement into a mixing tank to be mixed together at first, and then pouring the mixed liquid into a stratum to be mixed with sludge, wherein the using amount of the cement accounts for 10-20% of the amount of the sludge, and the mass ratio of the seawater to the cement is (1-1.2):2; adding superfine silica fume with the fineness of 0.1 micronmeter-0.2micronmeter as a doping material in a mixing process, wherein the mass ratio of the doping material to the cement is 1:(4-5); and with a compound which is formed by mixing sodium bicarbonate and sodium hydrogen phosphate according to the mass ratio of 1:(1-2) as an exciting agent and a corrosion inhibitor, dissolving the compound into the seawater according to that the ratio of mass g to volume ml in the seawater is 0.5-1%, and then feeding the mixture into the mixed sludge. Compared with the prior art, the seawater mixing cemented soil has a comprehensive inhibiting effect on the erosion of sulfates, chlorine salts and magnesium salts in the seawater to the cemented soil, the expansion growth is not more than 10%, the strength of the obtained cemented soil is not only not influenced but also improved by about 50%, and the erosion of the seawater to machines and tools can also be eliminated.

Description

technical field [0001] The invention relates to a preparation method of seawater mixed slurry cement soil. Background technique [0002] As an important link in the implementation of marine development strategy, tidal flat application development is being carried out widely in coastal areas. However, due to the widespread distribution of muddy soft soil in coastal areas, the soil is weak and the strength is extremely low, and cement soil is often used in foundation treatment and foundation pit engineering. Mixing piles are used as a means of foundation strengthening and foundation pit maintenance. Cement soil is formed by injecting cement slurry into the ground through a mud pump and mixing with silt, and using the hardening reaction of cement slurry and soil to form cement soil after solidification, which can be used for foundation reinforcement or foundation pit maintenance. The seawater cement soil is the foundation treatment material obtained by mixing seawater and ceme...

AI Technical Summary

Problems solved by technology

"Experimental Research on the Solidification of Tianjin Marine Soft Soil with Cement and Its Additives" ("Rock and Soil Mechanics", Yang Aiwu et al., 2007, 28 (9)) discloses that the addition of industrial caustic soda improves the alkaline environment of marine sedimentary soil and inhibits calcium The formation of vanadium stone and the technical measures to increase the content of calcium silicate hydrate have achieved a good reinforcement effect, but caused the soil to be strongly alkaline

There is also a technical disclosure of using lime as an admixture to improve the reinforcement strength of marine soft soil, but this method will aggravate sulfate erosion, and its application is limited

[0005] In the above studies, only the ionic components contained in the marine sedimentary soft soil are not good for cement soil solidification, and the passive treatment of the marine sedimentary soft soil foundation